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Managing queries

Overviewโ€‹

This page describes how to manage queries in an Aerospike Database cluster.

Queries can be initiated in parallel, and each query uses its own dedicated threads so that queries will not interfere with each other.

Long queries can be independently throttled with a specified requested records per second RPS value.

note

Prior to Database 6.0, primary index (PI) queries were called scans and secondary index (SI) queries were called queries. Both types of query are managed through a unified interface and run on a common subsystem.

Tuning Queriesโ€‹

You can tune various parameters that control the query subsystem, including:

For more information regarding these configuration parameters and their default values, see Configuration Reference.

Updating Query Settingsโ€‹

The above parameters can be dynamically set in the cluster using Aerospike Admin (asadm), using the following command:

note

Tools package 6.0.x or later is required to use asadm's manage config commands. Otherwise, use the equivalent asinfo - set-config command.

asadm -e "enable; manage config service param <name> to <value>"

Where <name> is the configuration parameter name and <value> is the parameter value.

Query Job Managementโ€‹

Query job management is only relevant to long queries.

List Queriesโ€‹

Use the following command to list long queries with asadm in Tools package 6.2.x or later:

asadm -e 'show jobs queries'

Configure the number of completed queries to track with the query-max-done parameter. Active long queries are always tracked. Not specifying a trid (transaction id) will list all active queries and up to query-max-done most recently completed long queries.

Example for an SI query returning a single record:

Admin+> show jobs queries trid 15021089193528544137
~~~~~~~~~~~~~Query Jobs (2022-11-30 23:21:42 UTC)~~~~~~~~~~~~~
Node |mycluster-1:3000 |172.17.0.2:3000
Namespace |test |test
Module |query |query
Type |basic |basic
Progress % |100.0 |100.0
Transaction ID |15021089193528544137|15021089193528544137
Time Since Done |00:12:51 |00:12:51
active-threads |0 |0
from |127.0.0.1+60036 |172.17.0.3+55372
n-pids-requested |2.048 K |2.048 K
net-io-bytes |30.000 B |149.000 B
net-io-time |00:00:00 |00:00:00
recs-failed |0.000 |0.000
recs-filtered-bins|0.000 |0.000
recs-filtered-meta|0.000 |0.000
recs-succeeded |0.000 |1.000
recs-throttled |0.000 |0.000
rps |0.000 |0.000
run-time |00:00:00 |00:00:00
set |testset |testset
sindex-name |mysindex |mysindex
socket-timeout |00:00:30 |00:00:30
status |done(ok) |done(ok)
Number of rows: 23

List queries with asinfo against Database 6.0 or later:

asinfo -v 'query-show'
asinfo -v 'query-show:trid=<jobid>'

Examples (against Database 6.2 -- Database 6.1 does not display the sindex-name):

  • This example shows a PI query that times out on the client side. The default timeout of 1 second is used on aql causing the server to fail returning all the records. Instead, the query returns a subset of the 1M records that were on the namespace:
Admin+> asinfo -v 'query-show:trid=15648753051941266254'
mycluster-1:3000 (172.17.0.3) returned:
trid=15648753051941266254:job-type=basic:ns=test:n-pids-requested=2048:rps=0:active-threads=0:status=done(abandoned-response-timeout):job-progress=100.00:run-time=1066:time-since-done=14817072:recs-throttled=0:recs-filtered-meta=0:recs-filtered-bins=0:recs-succeeded=250319:recs-failed=0:net-io-bytes=17826771:net-io-time=856:socket-timeout=30000:from=127.0.0.1+59856

172.17.0.2:3000 (172.17.0.2) returned:
trid=15648753051941266254:job-type=basic:ns=test:n-pids-requested=2048:rps=0:active-threads=0:status=done(abandoned-response-timeout):job-progress=100.00:run-time=1055:time-since-done=14816025:recs-throttled=0:recs-filtered-meta=0:recs-filtered-bins=0:recs-succeeded=276896:recs-failed=0:net-io-bytes=20972559:net-io-time=854:socket-timeout=30000:from=172.17.0.3+55192
  • This example shows an SI query that returns a single record:
Admin+> asinfo -v 'query-show:trid=15021089193528544137'
mycluster-1:3000 (172.17.0.3) returned:
trid=15021089193528544137:job-type=basic:ns=test:set=testset:sindex-name=mysindex:n-pids-requested=2048:rps=0:active-threads=0:status=done(ok):job-progress=100.00:run-time=29:time-since-done=502877:recs-throttled=0:recs-filtered-meta=0:recs-filtered-bins=0:recs-succeeded=0:recs-failed=0:net-io-bytes=30:net-io-time=0:socket-timeout=30000:from=127.0.0.1+60036

172.17.0.2:3000 (172.17.0.2) returned:
trid=15021089193528544137:job-type=basic:ns=test:set=testset:sindex-name=mysindex:n-pids-requested=2048:rps=0:active-threads=0:status=done(ok):job-progress=100.00:run-time=24:time-since-done=502880:recs-throttled=0:recs-filtered-meta=0:recs-filtered-bins=0:recs-succeeded=1:recs-failed=0:net-io-bytes=149:net-io-time=0:socket-timeout=30000:from=172.17.0.3+55372

Abort Queriesโ€‹

Kill a Query Job:

Kill a running query with Tools package 6.2.x or later:

asadm -e 'enable; manage jobs kill trid <jobid>'

Important Statistics to Monitorโ€‹

Admin> show stat namespace for test like query

Query Histogramsโ€‹

An overall query histogram is written to the log file every 10 seconds. For more details refer histograms page.

Jun 16 2022 17:02:22 GMT: INFO (info): (hist.c:321) histogram dump: {test}-pi-query (1 total) msec
Jun 16 2022 17:02:22 GMT: INFO (info): (hist.c:340) (07: 0000000001)
Jun 16 2022 17:02:22 GMT: INFO (info): (hist.c:321) histogram dump: {test}-pi-query-rec-count (1 total) count
Jun 16 2022 17:02:22 GMT: INFO (info): (hist.c:340) (10: 0000000001)
Jun 16 2022 17:02:22 GMT: INFO (info): (hist.c:321) histogram dump: {test}-si-query (1 total) msec
Jun 16 2022 17:02:22 GMT: INFO (info): (hist.c:340) (02: 0000000001)
Jun 16 2022 17:02:22 GMT: INFO (info): (hist.c:321) histogram dump: {test}-si-query-rec-count (1 total) count
Jun 16 2022 17:02:22 GMT: INFO (info): (hist.c:340) (10: 0000000001)

SI Query Microbenchmarksโ€‹

SI query microbenchmarks are not supported from Database 6.0 onwards.

Recommendationsโ€‹

Enable tracking only if you run long-running SI queries or for debugging.

asadm โ€“ Killing Jobs
asinfo - Reference